2 cups water (~500 ml)
1/4 cup hydrogen peroxide (~50 ml)
1.5 oz citric acid powder (~50 ml)
Soak the copper mesh completely submerged in the solution for about nine minutes.
CAUTION: The byproduct is Copper Sulfate, one of the most toxic substances known to man. Handle appropriately.
If this recipe helped your production run smother and safer (less toxic), would you buy me a beer? Thanks! 🍻 Cheers!